Cooking apparatus with water-bath.



n G. LAQUAI. COOKING APPARATUS VWITH WATER BATH. APPLICATION FILED'MAY 20. 1918.

1,299,963, Patented Apr. 8,1919.

.; e STATES PATENT oTTicE- GEORGE LAQUAI, OF ZURICH, SWITZERLAND.

COOKING APPARATUS WITH WATER-BATH. I

To all whom it may concern Be it known that I, GEORGE LA' UAI, a citizen of the Republic of Switzerland, residing at Zurich, Switzerland, have invented certainnew and useful Improvements in Cook,- ing Apparatus with Water-Bath; and I do hereby declare the following to be a clear, full, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawing, and to letters or figures of reference marked thereon, which form a part of this specification.

This invention relates to a cooking-apparatus with water-bath.

The object of the invention is to provide a cooking-apparatus with a water-bath comprising a water-vessel consisting of a single piece of sheet-metal which, starting at an upper central aperture, is strongly bulged out sidewise and which is vaulted outward from its greatest width in the direction toward the bottom, the vaulted wall portion being provided with undulations extending around about its circumference so that a meridian cross section through said vaulted vessel portion has the shape of a curve provided with undulations. The cooking-apparatus according to this invention comprises further a cooking-vessel projecting into the water-bath and fitting in the central aperture of the water-vessel, said cooking-vessel being for the reception of the food to be cooked.

This invention will now be more particu-' larly described with reference to the accompanying drawing illustrating a vertical cross-section through a constructional example of the invention.

Referring to the drawing, 1 denotes a water-vessel made of a single piece of sheetmetal and having an upper central aperture 2'. Starting at the aperture 2, the vessel 1 is strongly bulged out sidewise. The vessel 1 has a bottom comprising a middle portion 3 and an adjacent outer portion 7, the two portions 8, 7 being connected by a shoulder 8.

.Into the wall portion of the vessel 1 which is vaulted outward and which lies between the vessel portion having the greatest Width and the bottom portion are pressed a plurality about the vessel and imparting to the meridian cross-section through said vessel portion the shape of a curve having undulations.

Specification of Letters Patent.

of undulations 1 extending around Patented. Apr. 8, 1919.

Application filed May 20, 1918. Serial No. 235,531.

5 denotes a cooking-vessel resting by means of a shoulder on the upper rim of the vessel 1 and projecting into the latter. The cookingvessel 5 is closed by means of a cover which fits in the aperture 2 of the water-vessel 1.

When the water-vessel 1 of the hereinbefore described cooking-apparatus is put on a cooking-stove or on a cooking-pot, the water contained in the vessel 1 is heated. The cooking-vessel 5 can be removed, the cover 6 being then put on the vessel 1. When the cooking-vessel 5 is inserted into the water-vessel 1, the water contained in the latter heats the food contained in the vessel 5 extending partly intosaid water or prepares it for a further treatment.

It has been found that the undulations 4 do not only increase the strength of the vessel 1 but increase also the utilization of the heatcontained in the gases coming in contact With the vessel 1, as said undulations have the effect to keep the gases in contact with the wall of the vessel 1 while they stream upward. The utilization of heat is also improved in consequence of the peculiar shape given to thebottom 3, 7, 8 and 'to the part lying between the bottom portion 7 and the greatest width of the vessel 1, the shape of said part having the effect to deviate the heating gases in the most advantageous manner from the bottom 3, 7, 8 toward the side wall of the vessel 1. Also the strongly bulged upper portion of the vessel 1 has the ing, said vessel being, starting from the central opening and extending downwardly to its maximum diameter, strongly bulged out sidewise and vaulted outward from its maximum diameter toward the bottom, this lower vaulted portion being provided with circumferential undulations and imparting to the meridian section of said portion of the vessel the form of a curve provided with undulations, and a cooking vessel adapted to fit into the central opening of the water vessel and to receive the food to be cooked over the water-bath.

2. A water-bath cooking apparatus, comprising a water vessel having a central opening, said vessel starting from the central" opening and extending downwardly to its maximum diameter being strongly bulged out sideWise and vaulted outward from its maximum diameter toward thebottom, this lower vaulted portion being provided with undulations running around it and impart ing to the meridian sectionof said portion of the Vessel the form of a curve provided with undulations, and the bottomof the water vessel having acentral downwardly projeoti-ng part and an outer partly-ing-in a different. horizontal plane and Connected to sai central. part by meansof a shoulder, a

- cooking vessel fitting in saidoentr-al aperture and provided with. a shoulder. adaptedto rest on the upper rim of the water-vessel,

and a removable cover adapted to fit in the cooking vessel as well as in the central aperture of the water vessel.

3. A water-bath cooking utensil comprising-a water vessel having an open top, a fiat bottom having a shouldered 0 set from the lower body portion of the vessel, said body portion having a plurality of corrugations sinuous in section below the greatest diameter of said vessel, and a cooking vessel arranged to. seat in theopen top and a removable cover. arranged to; fitiboth the cook; ing vessel and the waterr vessel. '9

In testimony that I- claim. the foregoing as my invention, I have signed my name.

GEORGE LAQUAI,

Copies 01 this patent maylbe obtained' i'or five cents each, by addressing the Commissioner-o1lfatents, Washington, D. 0. 

